Add File Extension to Group of Files from Command Line on Mac OS

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The fastest way to add a file extension to a group of files that don’t currently have one is to use the command line in Mac OS X. In the example below, we are adding the extension ‘.txt’ to all files in a single folder, but using .txt in the command string will add another extension instead. Before you start, it’s a good idea to do the following:

  • Make sure the file extensions are visible on all files in Mac OS X, that way the extension change will be visible in the Finder next to the command line
  • Place all files for which the extension is to be added in a single and separate folder

How to Batch Add file extensions in the Mac OS command line

Assuming you have fulfilled the previous requirements, launch Terminal (found in / Applications / Utilities /) and do the following:

You can also drag and drop a folder from the Finder to the terminal window to print the path, instead of entering it manually.

Below is a complete example of a directory change, listing the original contents, running the appropriate command to add the extension and finally a list of the original files with the new .txt extension added.

$ mkdir ~ / Desktop / FilesThatNeedExtensionsAdded /

$ mv tes * ~ / Desktop / FilesThatNeedExtensionsAdded /

$ cd ~ / Desktop / FilesThatNeedExtensionsAdded /

$ lstest test1 test2 test3 test4

$ before I in *; do mv “$ i” “$ i.txt”; done

$ lstest.txt test1.txt test2.txt test3.txt test4.txt

As mentioned before, to add another file extension, replace the “.txt” with something else, such as “.jpg” or “.rtf”. The wildcards can also be modified to match the common file names.

Thanks to Thom for the tip idea

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Add a File Extension to a Group of Files from the Command Line in Mac OS X: FAQ

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What is actual time in which this method complete?

The time to complete the Add a File Extension to a Group of Files from the Command Line in Mac OS X tutorial is 10+ minutes.

What are the supported Device?

Apple

What are the supported Operating system?

mac OS


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